CN111357191B - Motor control device, motor control method, electric compressor, and air conditioner for moving object - Google Patents
Motor control device, motor control method, electric compressor, and air conditioner for moving object Download PDFInfo
- Publication number
- CN111357191B CN111357191B CN201880069379.8A CN201880069379A CN111357191B CN 111357191 B CN111357191 B CN 111357191B CN 201880069379 A CN201880069379 A CN 201880069379A CN 111357191 B CN111357191 B CN 111357191B
- Authority
- CN
- China
- Prior art keywords
- control
- rotation speed
- motor
- torque
- control device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 23
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/02—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for optimising the efficiency at low load
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
- B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/03—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for very low speeds
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/20—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for controlling one motor used for different sequential operations
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The present invention provides a motor control device, which comprises: a control unit that controls the rotation speed of the motor according to the required rotation speed by performing 1 st control capable of performing high torque and precise control of the motor or 2 nd control capable of performing control with higher efficiency than 1 st control of the motor; and a switching determination unit that switches from the 1 st control to the 2 nd control when the actual rotation speed value of the motor exceeds a predetermined rotation speed threshold value. The switching determination unit also switches from the 1 st control to the 2 nd control when the rotation speed actual measurement value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed since a point in time when the rotation speed actual measurement value matches the requested rotation speed.
Description
Technical Field
The present invention relates to a motor control device, an electric compressor provided with the motor control device, an air conditioner for a moving object, a motor control method, and a motor control program.
The present application claims priority based on japanese application publication No. 2017-222638 of 2017, 11, 20 and the contents thereof are incorporated herein.
Background
As one of the constituent elements of an in-vehicle air conditioner mounted on a vehicle, there is an electric compressor. In general, a motor of an electric compressor is driven by ac power whose voltage and frequency are regulated by an inverter functioning as a speed change device. Therefore, in order to properly control the electric compressor, it is necessary to perform proper inverter control in accordance with a change in operation demand at the time of start-up or after start-up, a change in load, and the like.
Patent document 1 describes a control method for a motor and a control device for a motor, in which the control method is a control method in which the accuracy of estimating the position of a magnet rotor is a priority and the control method is a control method in which silence is a priority, and a switching condition is defined.
Technical literature of the prior art
Patent literature
Patent document 1 Japanese patent laid-open publication No. 2003-102193
Disclosure of Invention
Technical problem to be solved by the invention
However, depending on the use of the vehicle-mounted air conditioner, the motor of the electric compressor may be stopped unintentionally against the instruction due to a long-time continuation of the high torque load state, abrupt change in the required rotation speed, or the like. An example of this is out-of-step, but there is a possibility that an abnormal current flows in a control circuit of the motor-driven compressor due to the out-of-step, for example, a spike current is generated, and an electronic component on the circuit is affected.
However, the compressor described in patent document 1 has the following problems. That is, by the control method and the switching method defined in the above, when the factor causing the step-out occurs, the stopping of the motor cannot be prevented. Therefore, depending on the operation conditions, the stopping of the motor may interfere with the normal operation of the electronic components on the control circuit of the electric compressor or damage the electronic components themselves.
Accordingly, an object of the present invention is to provide a motor control device, an electric compressor, an air conditioner for a moving object, and a control method for the electric compressor, which can solve the above-described problems.
Means for solving the technical problems
In order to solve the above problems, the present invention adopts the following method. That is, a motor control device is characterized by comprising: a control unit that controls the rotational speed of the motor according to a required rotational speed by performing 1 st control capable of performing high torque and precise control of the motor or 2 nd control capable of performing control with higher efficiency than 1 st control of the motor; and a switching determination unit that switches from the 1 st control to the 2 nd control when the actual rotation speed value of the motor exceeds a predetermined rotation speed threshold, and switches from the 1 st control to the 2 nd control when a predetermined time elapses from a time point when the actual rotation speed value is equal to or less than the rotation speed threshold and the actual rotation speed value matches the requested rotation speed.
According to this configuration, for example, it is possible to prevent a step-out when switching between two motor controls at the time of starting the motor of the electric compressor. For example, the 1 st control is a control that enables high torque and high precision operation, but is not good at high efficiency/wide range operation. On the other hand, the 2 nd control is a control that is not good at high torque and high accuracy operation but can perform high efficiency/wide range operation. In this case, the timing of switching from the 1 st control to the 2 nd control can be relatively advanced. That is, even when a situation may occur in which the step-out is caused as described above (such as the continuation of the high torque load state or a rapid change in the required rotational speed), the control can be shifted to the 2 nd control capable of the wide-range operation without waiting until the actual rotational speed value of the motor exceeds the predetermined rotational speed threshold value. In addition, even if no step-out occurs in the 1 st control, the step-out may occur when switching from the 1 st control to the 2 nd control, but in this case, the switching is performed in a state where the required rotation speed and the actually measured rotation speed are kept in agreement for a predetermined time, so that the risk of step-out at the time of switching can be reduced. Further, by setting the 1 st control after the start to a shorter period, even when the refrigerant must be compressed at a relatively high pressure such as when the outside air temperature is high, the 2 nd control with excellent efficiency can be preferentially performed, and therefore overheating of the IGBT (insulated gate bipolar transistor) can be suppressed.
The motor control device may be configured to control the motor as follows: a motor control device is provided with: a control unit that controls a rotation speed of a motor by performing a 1 st control or a 2 nd control on the motor, the 1 st control being capable of tracking a required rotation speed or a torque load applied to the motor in a first predetermined time unit, the 2 nd control being capable of tracking the required rotation speed or the torque load in a second predetermined time unit, the second predetermined time unit being longer than a first predetermined time unit in the 1 st control, and a switching determination unit that switches from the 1 st control to the 2 nd control when a measured rotation speed value of the motor exceeds a predetermined rotation speed threshold, the switching determination unit being further capable of switching from the 1 st control to the 2 nd control when the measured rotation speed value is equal to or less than the rotation speed threshold and when a predetermined time has elapsed since a time point at which the measured rotation speed value matches the required rotation speed.
According to this configuration, for example, when the control in which the high-precision control can be performed by tracking the fluctuation of the required rotation speed or the torque load applied to the motor in units of microseconds is the 1 st control and the control in which the tracking can be performed in units of milliseconds is the 2 nd control, the timing of switching from the 1 st control to the 2 nd control can be made relatively early. That is, even when a situation may occur in which the above-described step-out is a factor, the motor stop such as step-out can be prevented by switching to the control insensitive to the fluctuation of the required rotation speed without waiting until the actual rotation speed value of the motor exceeds the predetermined rotation speed threshold value.
In the motor control device, the switching determination unit may switch from the 1 st control to the 2 nd control when the variation in the required rotation speed is equal to or greater than a predetermined variation threshold.
According to this configuration, since the fluctuation of the required rotation speed, which is a cause of the step-out, is directly set as the condition for switching, the step-out can be prevented more reliably.
The following may also be used: the motor control device may further include a torque-related parameter acquisition unit that acquires a parameter related to a torque to be output by the motor, and the switching determination unit may switch from the 1 st control to the 2 nd control when the torque estimated from the acquired parameter exceeds a torque threshold.
According to this configuration, since an increase in torque load that causes a step-out is directly set as a condition for switching, the step-out can be more reliably prevented.
In the motor control device, the predetermined time may be 1 second.
According to this configuration, the motor control can be switched sufficiently earlier than the required rotation speed or the constant high torque load applied to the motor, and therefore, the step-out can be prevented more reliably.
The motor control method according to the present invention is characterized by comprising: a step of controlling the rotation speed of the motor according to a required rotation speed by executing a 1 st control capable of performing high torque and precise control of the motor or a 2 nd control capable of performing higher efficiency control than the 1 st control of the motor; and switching from the 1 st control to the 2 nd control when the actual rotation speed value of the motor exceeds a predetermined rotation speed threshold, and switching from the 1 st control to the 2 nd control when the actual rotation speed value is equal to or less than the rotation speed threshold and when a predetermined time has elapsed from a point in time when the actual rotation speed value matches the required rotation speed.
The electric compressor according to the present invention is characterized by comprising the motor control device.
The air conditioner for a mobile object according to the present invention is characterized by comprising the above-described electric compressor.
The motor control program according to the present invention is characterized in that it causes a computer to execute the motor control method.
Effects of the invention
According to the motor control device, the electric compressor provided with the motor control device, the air conditioner for a moving object, the motor control method, and the motor control program, the motor control device, the electric compressor provided with the motor control device, and the air conditioner for a moving object can be improved in reliability by preventing the motor from being out of step.
Drawings
Fig. 1 is a schematic block diagram of a vehicle as a mobile body on which an air conditioner including an electric compressor having a motor control device according to a first embodiment of the present invention is mounted.
Fig. 2 is a schematic block diagram of an electric compressor having a motor control device according to a first embodiment of the present invention.
Fig. 3 is a flowchart showing an example of motor control according to the first embodiment of the present invention.
Fig. 4 is a flowchart showing an example of motor control according to the second embodiment of the present invention.
Fig. 5 is a schematic block diagram of an electric compressor having a motor control device according to a third embodiment of the present invention.
Fig. 6 is a flowchart showing an example of motor control according to the third embodiment of the present invention.
Detailed Description
First embodiment
A motor control method of an electric compressor according to a first embodiment of the present invention will be described below with reference to fig. 1 to 6.
Fig. 1 is a schematic block diagram of a vehicle 100 as a moving body on which an air conditioner 1 provided with an electric compressor 11 having a motor control device 51 according to a first embodiment of the present invention is mounted.
Fig. 1 shows an ECU (Electric Control Unit, electronic control unit) 2 mounted on a vehicle 100 and an air conditioner 1 for a vehicle. As shown, the vehicle 100 includes an ECU2 and an air conditioner 1. The air conditioner 1 further includes an electric compressor 11. The ECU2 performs control of electrical devices of the vehicle 100. The air conditioner 1 is a vehicle-mounted air conditioning unit. The electric compressor 11 is an electric compressor used for an in-vehicle air conditioner. The electric compressor 11 is an inverter-integrated electric compressor in which the inverter device 41 is integrally assembled. The ECU2 is connected to the air conditioner 1 by a signal line, a communication line, a power line, or the like, and the air conditioner 1 receives a control signal of the ECU2 through CAN (Controller Area Network ) communication and performs a desired operation by a user. For example, when the user performs an operation to start the air conditioning operation, the ECU2 outputs a control signal corresponding to the operation to the air conditioner 1, and the air conditioner 1 starts the operation according to the control signal. When the user sets the temperature in the vehicle, the ECU1 generates a control signal corresponding to the set temperature and controls the operation state of the air conditioner 2.
Fig. 2 is a schematic block diagram of the electric compressor 11 having the motor control device 51 according to the first embodiment of the present invention. The electric compressor 11 is an inverter-integrated electric compressor, and includes an inverter device 41, a motor 12, and a compression unit 10.
The inverter device 41 converts dc power supplied from a power source (not shown) such as a battery into three-phase ac power, and supplies the three-phase ac power to the motor 12. The motor 12, which receives electric power, rotates, and transmits the rotation force to the compression part 10 mechanically connected to the motor 12. The compression unit 10 receiving the rotational force supplies the refrigerant to a refrigerant circuit (not shown) provided in the air conditioner 1.
The inverter device 41 has a motor control device 51. The motor control device 51 includes a control unit 61 and a switching determination unit 71.
The control unit 61 includes a 1 st control means 611 for performing control 1 and a 2 nd control means 612 for performing control 2. In the present embodiment, the 1 st control means 611 is a means for performing control (referred to as control 1) that enables high torque and high precision operation, but is not superior to high efficiency/wide range operation. Therefore, the control is suitable for driving the motor 12 at low speed/high torque, and is effective when a particularly large starting torque is required. Therefore, the motor control device 51 according to the present embodiment performs control 1 when the motor 12 is started. That is, when the user performs an operation to start the air conditioning operation, the ECU1 outputs a control signal corresponding to the operation to the air conditioner 1, and the air conditioner 1 receives the signal and starts driving of the motor 12 by inverter control controlled by the control section 61 using the 1 st control mechanism 611.
Further, since the calculation of the voltage and the like in the control 1 according to the present embodiment is performed in units of microseconds, the required rotation speed can be tracked sensitively. Therefore, the motor operation with high accuracy can be performed.
On the other hand, in the present embodiment, the 2 nd control means 612 is a means for performing high-torque and high-precision operation, but can perform control (referred to as control 2) of high-efficiency/wide-range operation. Further, since the calculation of the control 2 in the present embodiment is performed in units of milliseconds, there is an advantage that the required rotation speed is not excessively sensitively tracked and the resistance to abrupt variation is strong, so that the high-efficiency and wide-range operation can be performed. Therefore, in the motor control device 51 according to the present embodiment, after the motor 12 is started, the control 1 is first performed, and then the control is switched to the control 2.
Next, the switching determination unit 71 will be described in detail. The switching determination unit 71 includes a rotation speed actual measurement value calculation means 711.
The switching determination unit 71 in the present embodiment determines to switch from control 1 to control 2, and if the conditions are satisfied, transmits a switching signal to the control unit 61. As one of the conditions, the switching determination unit 71 in the present embodiment may compare the actual rotation speed value obtained from the actual rotation speed value calculation unit 711 with a predetermined threshold value if the actual rotation speed value exceeds the predetermined threshold value. For example, the predetermined threshold is 2000rpm. At this time, the control is forcibly switched regardless of other conditions. That is, when the rotation speed of the motor 12 reaches a predetermined threshold or more after the user starts running the air conditioner, the switching determination unit 71 instructs the control unit 61 to switch to the control 2, and the control unit 61 drives the electric compressor by the control 2 in accordance with the instruction.
As described above, the motor control device 51 according to the present embodiment can obtain not only a desired operation effect but also an efficient motor driving to operate the electric compressor by performing control and switching thereof using the advantages of both controls.
Here, the switching determination unit 71 according to the present embodiment has a condition for switching even when the actual rotation speed value is equal to or less than the predetermined threshold. Specifically, the switching is performed even when a predetermined time elapses from a time point when the required rotation speed (rotation speed corresponding to the frequency of the electric power supplied to the motor 12) matches the rotation speed actual measurement value obtained from the rotation speed actual measurement value calculation means 711.
The predetermined time is, for example, 1 second.
Next, a flow of control switching in the motor control device 51 of the electric compressor according to the present embodiment will be described.
Fig. 4 is a flowchart showing an example of control switching in the motor control device 51 of the electric compressor according to the embodiment of the present invention.
First, the determination unit compares the rotation speed actual measurement value obtained from the rotation speed actual measurement value calculation unit 711 with a predetermined threshold value (step S13), and when the rotation speed actual measurement value exceeds the predetermined threshold value (step S13; yes), the control 2 is forced (step S14). On the other hand, if the rotational speed does not exceed the required rotational speed (step S13; no), the determination unit then determines whether or not the rotational speed actual measurement value matches the required rotational speed (step S15). When the difference is not found (step S15; yes), control 1 is executed (step S16). When the rotation speed is equal to the required rotation speed (step S15; yes), the determination unit then compares the time for which the rotation speed actual measurement value is equal to the required rotation speed with a predetermined time (step S17). As a result of the comparison, when the time for which the agreement is maintained does not exceed the predetermined time (step S17; no), control 1 is continued (step S18). When the operation is exceeded (step S17; yes), control 2 is executed (step S19).
In the motor control device 51 having the above-described configuration, when switching from control 1 to control 2, if the rotation speed measured value matches the required rotation speed for a predetermined period of time, control 2 is executed even if the threshold value determined by the rotation speed is not exceeded. This can prevent the step-out when switching the two motor control methods, for example, when the motor 12 of the electric compressor is started. In the present embodiment, the timing at which the control 1 is switched from the control that enables the high-torque and high-precision operation, but is not good at the high-efficiency and wide-range operation, to the control 2 is switched from the control that is not good at the high-torque and high-precision operation, but is capable of the high-efficiency and wide-range operation, can be relatively advanced. That is, even when there is the factor of the step-out (such as a constant increase in torque load and a rapid change in the required rotational speed) as described above, the control 2 can be shifted to the control capable of the wide-range operation without waiting until the actual rotational speed value of the motor 12 exceeds the predetermined rotational speed threshold value, which is insensitive to the change in the required rotational speed. Further, even if the step-out does not occur when the control 1 is executed, the step-out may occur when the control 1 is switched to the control 2, but in this case, the switching is executed in a state where the required rotation speed and the actually measured rotation speed are kept in agreement for a predetermined time, so that the risk of the step-out at the time of switching can be reduced. This can suppress adverse effects on the control circuit caused by the generation of spike current or the like. Further, by performing the control 1 after the start-up in a shorter period of time, even when the refrigerant must be compressed at a relatively high pressure such as when the outside air temperature is high, the control 2 excellent in efficiency can be preferentially performed, and therefore, the overheat of the IGBT can be suppressed.
Therefore, the motor control device 51 according to the present embodiment can obtain higher reliability in the electric compressor 11 and the air conditioner for moving object 1 including the motor control device.
Second embodiment
Next, a second embodiment will be described. In the second embodiment, a different process is performed using the same constituent elements as those of the first embodiment. A flow of control switching in the motor control device 52 of the electric compressor according to the present embodiment will be described below with reference to fig. 4.
In the present embodiment, the process performed by the switching determination unit 72 is different from that of the first embodiment. Specifically, as a stage before using the rotation speed actual measurement value calculation means 711 provided in the switching determination unit 72, the fluctuation of the required rotation speed is tracked, and the fluctuation range per hour is compared with a predetermined threshold value (step S21). As a result, when the fluctuation range of the required rotation speed is larger than the predetermined threshold value, the control is switched to the control 2 without using the rotation speed actual measurement value calculation means 711 (step S21; yes). On the other hand, when the rotation speed is smaller than the predetermined threshold (step S21; no), the rotation speed actual measurement value calculation means 711 compares the actual measurement value of the rotation speed with the predetermined threshold (step S23). The flow of steps S23 to S29 subsequent to this sequence is the same as the flow of steps S13 to S19 in the first embodiment. In the present embodiment, steps S24, S26, and S28 are reached, and then, step S23 corresponding to step S13 in the first embodiment is returned to, but step S21 may be returned to.
In the motor control device 52 having the above-described configuration, when switching from control 1 to control 2, the switching to control 2 can be performed when the required rotation speed abruptly changes, regardless of the actual rotation speed value. That is, the fluctuation of the required rotation speed, which is the cause of the step-out, is directly set as the condition for switching.
For example, when the control 1 is a control that enables high-torque and high-precision operation, but is not good at high-efficiency and wide-range operation, and the control 2 is a control that is not good at high-torque and high-precision operation, but is capable of high-efficiency and wide-range operation, as in the first embodiment, if the required rotation speed abruptly fluctuates when the control 1 is implemented, the required rotation speed is to be tracked extremely carefully, and as a result, the possibility of occurrence of step-out increases. Therefore, by detecting a sudden change in the required rotation speed and switching to control 2 in accordance with the detection result, occurrence of a step-out can be suppressed. This prevents the motor 12 from being out of step. This can suppress adverse effects on the control circuit caused by the generation of spike current or the like.
Therefore, the motor control device 52 according to the present embodiment can obtain higher reliability in the electric compressor 12 and the air conditioner 2 for a moving object including the motor control device.
Third embodiment
Next, a third embodiment of the present invention will be described with reference to fig. 6. In the second embodiment, the same constituent elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The third embodiment is different from the first embodiment in the configuration of the switching determination unit 73. In the present embodiment, the switching determination unit 73 further includes a torque-related parameter acquisition unit.
The torque-related parameter acquisition portion acquires a parameter having a correlation with the torque generated by the motor 12. In the present embodiment, for example, the value of the current of the motor 12 is obtained to estimate the value of the torque of the motor 12.
In the present embodiment as well, the processing performed by the switching determination unit 73 is different from that of the first embodiment, as in the second embodiment. Specifically, as a stage before using the rotation speed actual measurement value calculation means 711 provided in the switching determination unit 73, when the estimated torque value calculated by the torque-related parameter acquisition unit 83 exceeds a predetermined threshold value, the control is switched to control 2.
The flow of control switching in the motor control device 53 of the electric compressor according to the present embodiment will be described below with reference to fig. 4.
In the present embodiment, the processing performed by the switching determination unit 71 is different from the first embodiment and the second embodiment. Specifically, as a stage before using the rotation speed actual measurement value calculation means 711 provided in the switching determination unit 71, the estimated torque value calculated by the torque-related parameter acquisition unit is compared with a predetermined threshold value (step S31). As a result, when the estimated torque value is greater than the predetermined threshold value, the control is switched to control 2 without using the rotation speed actual measurement value calculation means 711 (step S31; yes). On the other hand, when the rotation speed is smaller than the predetermined threshold (step S31; no), the rotation speed actual measurement value calculation means 711 compares the actual measurement value of the rotation speed with the predetermined threshold (step S33). The sequence subsequent to this sequence is the same as that of the first embodiment. The flow of steps S33 to S39 subsequent to this sequence is the same as the flow of steps S13 to S19 in the first embodiment. In the present embodiment, steps S34, S36, and S38 are reached, and then, step S33 corresponding to step S13 in the first embodiment is returned to, but step S31 may be returned to.
In the motor control device 53 having the above-described configuration, when switching from control 1 to control 2, it is possible to switch to control 2 when it is estimated that the motor 12 outputs a high torque, regardless of the actual rotation speed value. That is, the increase in torque load that causes the step-out is directly set as the condition for switching.
For example, when the control 1 is a control that enables high-torque and high-precision operation, but does not favor high-efficiency/wide-range operation, and the control 2 is a control that does not favor high-torque and high-precision operation, but enables high-efficiency/wide-range operation, as in the first embodiment, it is possible to switch to the control 2 that enables wider-range control in advance. In general, control 1 is a control capable of outputting a higher torque than control 2. However, when the in-vehicle air conditioner is started in a state in which the outside air temperature is abnormally high, a state in which high torque should be output sometimes becomes constant. In this case, if the control 1 is continued for a long period of time, there is a possibility that the step-out occurs. Therefore, by switching to control 2 in advance, the torque output is reduced, but adverse effects on the control circuit due to the generation of spike current or the like can be suppressed.
Therefore, the motor control device 53 according to the present embodiment can obtain higher reliability in the electric compressor 13 and the air conditioner 3 for a moving object including the motor control device.
In any of the above embodiments, the specific control method may be any method, but as an example of the first control (control 1), sensorless vector control is exemplified, and as an example of the second control (control 2), V/f control is exemplified.
The description has been made taking, as an example, a case where the electric compressors 11 and 13 constitute a part of the in-vehicle air conditioner of the vehicle 100, but the motor control devices 51 and 53 and the electric compressors 11 and 13 of the present embodiment can also be applied to an air conditioner of a refrigeration/chiller vehicle. The motor control devices 51 and 53 and the motor compressor 11 according to the present embodiment may be used as an air conditioner mounted on various moving bodies such as a ship, an airplane, and a railway, in addition to a vehicle.
Industrial applicability
According to the motor control device, the electric compressor provided with the motor control device, the air conditioner for a moving object, the motor control method, and the motor control program, the motor control device, the electric compressor provided with the motor control device, and the air conditioner for a moving object can be improved in reliability by preventing the motor from being out of step.
Symbol description
2-ECU,1, 3-air conditioner, 100-vehicle, 11-electric compressor, 41, 43-inverter device, 10-compression unit, 12-motor, 51, 53-motor control device, 61-control unit, 71, 73-switching determination unit, 611-1 st control unit, 612-2 nd control unit, 711-measured rotational speed calculation unit, 83-torque-related parameter acquisition unit.
Claims (8)
1. A motor control device is provided with:
a control unit that controls the rotational speed of a motor according to a required rotational speed by performing a 1 st control of the motor or a 2 nd control of the motor that can perform control with higher efficiency than the 1 st control; and
A switching determination unit configured to switch from the 1 st control to the 2 nd control when the actual rotation speed value of the motor exceeds a predetermined rotation speed threshold value,
the 1 st control is a control capable of high-torque, high-precision operation but not good for high-efficiency, wide-range operation, the 2 nd control is a control not good for high-torque, high-precision operation but capable of high-efficiency, wide-range operation,
the switching determination unit switches from the 1 st control to the 2 nd control when the rotation speed actual measurement value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a point in time when the rotation speed actual measurement value matches the required rotation speed.
2. A motor control device is provided with:
a control unit that controls the rotation speed of the motor according to a required rotation speed by performing a 1 st control or a 2 nd control on the motor, wherein the 1 st control is capable of tracking the required rotation speed or a torque load applied to the motor in a first predetermined time unit, the 2 nd control is capable of tracking the required rotation speed or the torque load in a second predetermined time unit, the second predetermined time unit being longer than the first predetermined time unit in the 1 st control, and
a switching determination unit configured to switch from the 1 st control to the 2 nd control when the actual rotation speed value of the motor exceeds a predetermined rotation speed threshold value,
the switching determination unit switches from the 1 st control to the 2 nd control when the rotation speed actual measurement value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a point in time when the rotation speed actual measurement value matches the required rotation speed.
3. The motor control device according to claim 1 or 2, wherein,
the switching determination unit also switches from the 1 st control to the 2 nd control when the variation in the required rotation speed is equal to or greater than a predetermined variation threshold.
4. The motor control device according to claim 1 or 2, further comprising:
a torque-related parameter acquisition unit that acquires a parameter related to torque to be output by the motor,
the switching determination unit switches from the 1 st control to the 2 nd control when the torque estimated from the acquired parameter exceeds a torque threshold.
5. The motor control device according to claim 1 or 2, wherein,
the predetermined time is 1 second.
6. A motor control method, comprising:
a step of controlling the rotation speed of the motor according to a required rotation speed by executing a 1 st control capable of controlling the motor or a 2 nd control capable of controlling the motor with higher efficiency than the 1 st control; and
A step of switching from the 1 st control to the 2 nd control when the actual rotation speed value of the motor exceeds a predetermined rotation speed threshold value,
the 1 st control is a control capable of high-torque, high-precision operation but not good for high-efficiency, wide-range operation, the 2 nd control is a control not good for high-torque, high-precision operation but capable of high-efficiency, wide-range operation,
in the step of switching to the 2 nd control, the 1 st control is switched to the 2 nd control also when the actual rotation speed value is equal to or less than the rotation speed threshold value and when a predetermined time has elapsed from a point in time when the actual rotation speed value matches the required rotation speed.
7. An electric compressor provided with the motor control device according to any one of claims 1 to 4.
8. An air conditioner for a moving body, comprising an electric compressor provided with the motor control device according to any one of claims 1 to 4.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-222638 | 2017-11-20 | ||
| JP2017222638A JP7044523B2 (en) | 2017-11-20 | 2017-11-20 | Motor control device and electric compressor equipped with it, air conditioner for moving body, motor control method and motor control program |
| PCT/JP2018/039425 WO2019097965A1 (en) | 2017-11-20 | 2018-10-24 | Motor control device, electric compressor equipped with same, air-conditioner for moving body, motor control method, and motor control program |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111357191A CN111357191A (en) | 2020-06-30 |
| CN111357191B true CN111357191B (en) | 2023-12-26 |
Family
ID=66539487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880069379.8A Active CN111357191B (en) | 2017-11-20 | 2018-10-24 | Motor control device, motor control method, electric compressor, and air conditioner for moving object |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11418136B2 (en) |
| JP (1) | JP7044523B2 (en) |
| CN (1) | CN111357191B (en) |
| DE (1) | DE112018005917T5 (en) |
| WO (1) | WO2019097965A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7247152B2 (en) | 2019-09-30 | 2023-03-28 | ダイキン工業株式会社 | Motor driving method and motor driving device |
| AU2020380962B2 (en) * | 2019-11-08 | 2023-11-02 | Milwaukee Electric Tool Corporation | Motor control for gas engine replacement device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002233183A (en) * | 2001-01-31 | 2002-08-16 | Matsushita Electric Ind Co Ltd | Driving apparatus and method for brushless motor |
| JP2003102193A (en) * | 2001-09-21 | 2003-04-04 | Matsushita Electric Ind Co Ltd | Brushless motor operating device |
| JP2003164008A (en) * | 2001-11-28 | 2003-06-06 | Hitachi Ltd | Controller for hybrid vehicle |
| CN1649015A (en) * | 2004-01-20 | 2005-08-03 | 建兴电子科技股份有限公司 | Method for controlling pulley homing in optic disc machine |
| JP2010130844A (en) * | 2008-11-28 | 2010-06-10 | Mitsubishi Heavy Ind Ltd | Driving device for compressor motor and method of controlling inverter |
| JP2013070468A (en) * | 2011-09-21 | 2013-04-18 | Hitachi Automotive Systems Ltd | Drive unit of brushless motor |
| JP2013198243A (en) * | 2012-03-19 | 2013-09-30 | Hitachi Appliances Inc | Motor control device, motor driving device using the same, compressor, freezing device, air conditioner, and motor control method |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06225588A (en) * | 1993-01-21 | 1994-08-12 | Toyota Motor Corp | Controller for winding switching type permanent magnet motor |
| JP3565236B2 (en) * | 1996-02-29 | 2004-09-15 | 株式会社安川電機 | Motor control device and switching method thereof |
| JP3533091B2 (en) * | 1998-07-29 | 2004-05-31 | トヨタ自動車株式会社 | AC motor drive controller |
| JP2002202064A (en) | 2001-01-09 | 2002-07-19 | Toyota Industries Corp | Control method of motor-driven compressor |
| JP2005073104A (en) | 2003-08-27 | 2005-03-17 | Yaskawa Electric Corp | Motor controller |
| JP2005168196A (en) | 2003-12-03 | 2005-06-23 | Toshiba Corp | Inverter controller, drive controller of compressor, refrigerator and inverter control method, and recording medium |
| JP4480696B2 (en) | 2005-08-26 | 2010-06-16 | 三洋電機株式会社 | Motor control device |
| JP2007282319A (en) | 2006-04-03 | 2007-10-25 | Denso Corp | Synchronous motor control device |
| JP5495085B2 (en) * | 2011-02-28 | 2014-05-21 | アイシン・エィ・ダブリュ株式会社 | Electric vehicle drive device |
| JP2013034364A (en) | 2011-06-29 | 2013-02-14 | Panasonic Corp | Inverter control device, electric compressor using the same and electrical equipment |
| JP2013238682A (en) | 2012-05-14 | 2013-11-28 | Konica Minolta Inc | Image forming apparatus |
| CN111228511B (en) | 2014-04-10 | 2024-06-18 | 第一三共株式会社 | Anti-HER 3 antibody-drug conjugates |
| JP6167982B2 (en) * | 2014-04-23 | 2017-07-26 | 株式会社豊田自動織機 | Motor drive device and electric compressor |
| EP3168980B1 (en) | 2015-08-04 | 2022-08-24 | Mitsubishi Electric Corporation | Synchronous motor control device, compressor drive device, air-conditioner, and method for controlling synchronous motor |
-
2017
- 2017-11-20 JP JP2017222638A patent/JP7044523B2/en active Active
-
2018
- 2018-10-24 DE DE112018005917.0T patent/DE112018005917T5/en active Pending
- 2018-10-24 US US16/763,154 patent/US11418136B2/en active Active
- 2018-10-24 WO PCT/JP2018/039425 patent/WO2019097965A1/en active Application Filing
- 2018-10-24 CN CN201880069379.8A patent/CN111357191B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002233183A (en) * | 2001-01-31 | 2002-08-16 | Matsushita Electric Ind Co Ltd | Driving apparatus and method for brushless motor |
| JP2003102193A (en) * | 2001-09-21 | 2003-04-04 | Matsushita Electric Ind Co Ltd | Brushless motor operating device |
| JP2003164008A (en) * | 2001-11-28 | 2003-06-06 | Hitachi Ltd | Controller for hybrid vehicle |
| CN1649015A (en) * | 2004-01-20 | 2005-08-03 | 建兴电子科技股份有限公司 | Method for controlling pulley homing in optic disc machine |
| JP2010130844A (en) * | 2008-11-28 | 2010-06-10 | Mitsubishi Heavy Ind Ltd | Driving device for compressor motor and method of controlling inverter |
| JP2013070468A (en) * | 2011-09-21 | 2013-04-18 | Hitachi Automotive Systems Ltd | Drive unit of brushless motor |
| JP2013198243A (en) * | 2012-03-19 | 2013-09-30 | Hitachi Appliances Inc | Motor control device, motor driving device using the same, compressor, freezing device, air conditioner, and motor control method |
Also Published As
| Publication number | Publication date |
|---|---|
| US20200313582A1 (en) | 2020-10-01 |
| US11418136B2 (en) | 2022-08-16 |
| WO2019097965A1 (en) | 2019-05-23 |
| DE112018005917T5 (en) | 2020-08-06 |
| CN111357191A (en) | 2020-06-30 |
| JP7044523B2 (en) | 2022-03-30 |
| JP2019097244A (en) | 2019-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3343751B1 (en) | Refrigerator | |
| JP3506457B2 (en) | Startup control method of compressor in air conditioner | |
| US9595899B2 (en) | Motor control device | |
| US10458420B2 (en) | Method for controlling motor-driven compressor configured to be installed in vehicle | |
| US20140152212A1 (en) | Method for smooth motor startup | |
| US10158318B2 (en) | Control device for in-vehicle electric motor | |
| US9431933B2 (en) | Inverter apparatus | |
| EP2538545B1 (en) | Sensorless control unit for brushless DC motor | |
| CN111357191B (en) | Motor control device, motor control method, electric compressor, and air conditioner for moving object | |
| EP2221478B1 (en) | Controller of electric compressor, start control method of electric compressor | |
| US20160245269A1 (en) | Motor-drive compressor | |
| US9611851B2 (en) | Control method of electric compressor, controller, and refrigerator | |
| US20150211533A1 (en) | Electric compressor | |
| CN113273077B (en) | Motor control device and air conditioner | |
| CN111615785B (en) | Electric compressor | |
| US10273958B2 (en) | Compressor driven by a motor based on a temperature of a drive circuit | |
| JP5344946B2 (en) | Electric compressor control device | |
| JP5960009B2 (en) | Refrigeration equipment | |
| CN111033041B (en) | Control device for electric compressor, air conditioning device for mobile body, and control method for electric compressor | |
| CN111034021B (en) | Current value determination device, control device, electric compressor, current value determination method, and control method | |
| US11628729B2 (en) | Inverter controller and on-vehicle fluid machine | |
| US11316467B2 (en) | Inverter controller and on-vehicle fluid machine | |
| US11933309B2 (en) | Method of starting a fan using an open loop starting stage with a decreasing drive signal value | |
| JP2022086670A (en) | In-vehicle electric compressor | |
| JP2015010537A (en) | Electric compressor and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |